Individual pyrrole molecules readily join together into larger molecules called polypyrroles. If polypyrroles form from pyrrole in the presence of zeolites, they do so by attaching to the zeolite either in lumps on the outer surface of the zeolite or in delicate chains within the zeolite's inner channels. When zeolite changes color from yellow to black, it means that on or in that zeolite polypyrroles have formed from pyrrole. Yellow zeolite free of any pyrrole was submerged in dissolved pyrrole. The zeolite, turned black even though no polypyrroles formed on its outer surface.
If the statements above are true, which one of the following must on the basis of them be true?
There are two ways that lead to change of color from yellow to black:
1. by attaching to the zeolite either in lumps on the outer surface of the zeolite
2. in delicate chains within the zeolite's inner channels
Thus, one or the other must have led to change in color and that must be true which we need to find out in the 5 choices.
(A)
Polypyrroles had already formed on or in the zeolite before it was submerged. - WRONG. Goes against last sentence of the passage.
(B) Lumps of polypyrrole attached to the zeolite were responsible for its color change. - WRONG. Just reiterates what's there in the passage.
(C) At least
some of the pyrrole in which the zeolite was submerged
formed polypyrrole chains. - CORRECT.
(D) None of the pyrrole in which the zeolite was submerged attached itself to the zeolite. - WRONG. Again it goes against the passage otherwise the color would not have changed.
(E) Little, if any, of the
pyrrole in which the zeolite was submerged
reached the zeolite's inner channels. - WRONG. A philosophical reasoning. The lie nearest to the truth is hard to catch OR one can say its a shell game that is being played by this choice.
Pyrrole reaching zeolite's inner channels is not enough for color change. What matters is whether polypyrroles are formed. This option does not tell us that. It was close though.Answer C.
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Pain + Reflection = Progress | Ray Dalio
Good Books to read prior to MBA